1------------------------------------------------------------------------------ 2-- -- 3-- GNAT RUN-TIME COMPONENTS -- 4-- -- 5-- S Y S T E M -- 6-- -- 7-- S p e c -- 8-- (Compiler Version) -- 9-- -- 10-- Copyright (C) 1992-2018, Free Software Foundation, Inc. -- 11-- -- 12-- This specification is derived from the Ada Reference Manual for use with -- 13-- GNAT. The copyright notice above, and the license provisions that follow -- 14-- apply solely to the contents of the part following the private keyword. -- 15-- -- 16-- GNAT is free software; you can redistribute it and/or modify it under -- 17-- terms of the GNU General Public License as published by the Free Soft- -- 18-- ware Foundation; either version 3, or (at your option) any later ver- -- 19-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 20-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 21-- or FITNESS FOR A PARTICULAR PURPOSE. -- 22-- -- 23-- As a special exception under Section 7 of GPL version 3, you are granted -- 24-- additional permissions described in the GCC Runtime Library Exception, -- 25-- version 3.1, as published by the Free Software Foundation. -- 26-- -- 27-- You should have received a copy of the GNU General Public License and -- 28-- a copy of the GCC Runtime Library Exception along with this program; -- 29-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- 30-- <http://www.gnu.org/licenses/>. -- 31-- -- 32-- GNAT was originally developed by the GNAT team at New York University. -- 33-- Extensive contributions were provided by Ada Core Technologies Inc. -- 34-- -- 35------------------------------------------------------------------------------ 36 37-- This version of System is a generic version that is used in building the 38-- compiler. Right now, we have a host/target problem if we try to use the 39-- "proper" System, and since the compiler itself does not care about most 40-- System parameters, this generic version works fine. 41 42pragma Restrictions (No_Implicit_Dynamic_Code); 43-- We want to avoid trampolines in the compiler, so it can be used in systems 44-- which prevent execution of code on the stack, e.g. in windows environments 45-- with DEP (Data Execution Protection) enabled. 46 47pragma Restrictions (No_Finalization); 48-- Use restriction No_Finalization to avoid pulling finalization (not allowed 49-- in GNAT) inside sem_spark.adb, when defining type Perm_Tree_Access as an 50-- access type on incomplete type Perm_Tree_Wrapper (which is required for 51-- defining a recursive type). 52 53package System is 54 pragma Pure; 55 -- Note that we take advantage of the implementation permission to make 56 -- this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada 57 -- 2005, this is Pure in any case (AI-362). 58 59 pragma No_Elaboration_Code_All; 60 -- Allow the use of that restriction in units that WITH this unit 61 62 type Name is (SYSTEM_NAME_GNAT); 63 System_Name : constant Name := SYSTEM_NAME_GNAT; 64 65 -- System-Dependent Named Numbers 66 67 Min_Int : constant := Long_Long_Integer'First; 68 Max_Int : constant := Long_Long_Integer'Last; 69 70 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size; 71 Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1; 72 73 Max_Base_Digits : constant := Long_Long_Float'Digits; 74 Max_Digits : constant := Long_Long_Float'Digits; 75 76 Max_Mantissa : constant := 63; 77 Fine_Delta : constant := 2.0 ** (-Max_Mantissa); 78 79 Tick : constant := 0.01; 80 81 -- Storage-related Declarations 82 83 type Address is private; 84 -- Note that we do NOT add pragma Preelaborable_Initialization in this 85 -- version of System, since it is used for the compiler only, and typical 86 -- earlier bootstrap compilers don't support this pragma. We don't need 87 -- it in this context, so there is no problem in omitting it. 88 Null_Address : constant Address; 89 90 Storage_Unit : constant := Standard'Storage_Unit; 91 Word_Size : constant := Standard'Word_Size; 92 Memory_Size : constant := 2 ** Standard'Address_Size; 93 94 -- Address comparison 95 96 function "<" (Left, Right : Address) return Boolean; 97 function "<=" (Left, Right : Address) return Boolean; 98 function ">" (Left, Right : Address) return Boolean; 99 function ">=" (Left, Right : Address) return Boolean; 100 function "=" (Left, Right : Address) return Boolean; 101 102 pragma Import (Intrinsic, "<"); 103 pragma Import (Intrinsic, "<="); 104 pragma Import (Intrinsic, ">"); 105 pragma Import (Intrinsic, ">="); 106 pragma Import (Intrinsic, "="); 107 108 -- Other System-Dependent Declarations 109 110 type Bit_Order is (High_Order_First, Low_Order_First); 111 Default_Bit_Order : constant Bit_Order := 112 Bit_Order'Val (Standard'Default_Bit_Order); 113 pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning 114 115 -- Priority-related Declarations (RM D.1) 116 117 Max_Priority : constant Positive := 30; 118 Max_Interrupt_Priority : constant Positive := 31; 119 120 subtype Any_Priority is Integer range 0 .. 31; 121 subtype Priority is Any_Priority range 0 .. 30; 122 subtype Interrupt_Priority is Any_Priority range 31 .. 31; 123 124 Default_Priority : constant Priority := 15; 125 126private 127 128 type Address is mod Memory_Size; 129 Null_Address : constant Address := 0; 130 131 -------------------------------------- 132 -- System Implementation Parameters -- 133 -------------------------------------- 134 135 -- These parameters provide information about the target that is used by 136 -- the compiler. They are in the private part of System, where they can be 137 -- accessed using the special circuitry in the Targparm unit whose source 138 -- should be consulted for more detailed descriptions of the individual 139 -- switch values. 140 141 -- This version of system.ads is used only for building the compiler. 142 -- We really ought to use the proper target system (i.e. the one that 143 -- corresponds to the host for the compiler), but that causes as yet 144 -- unsolved makefile problems. For the most part the setting of these 145 -- parameters is not too critical for the compiler version (e.g. we 146 -- do not use floating-point anyway in the compiler). 147 148 AAMP : constant Boolean := False; 149 Backend_Divide_Checks : constant Boolean := False; 150 Backend_Overflow_Checks : constant Boolean := False; 151 Command_Line_Args : constant Boolean := True; 152 Configurable_Run_Time : constant Boolean := False; 153 Denorm : constant Boolean := True; 154 Duration_32_Bits : constant Boolean := False; 155 Exit_Status_Supported : constant Boolean := True; 156 Fractional_Fixed_Ops : constant Boolean := False; 157 Frontend_Layout : constant Boolean := False; 158 Machine_Overflows : constant Boolean := False; 159 Machine_Rounds : constant Boolean := True; 160 Preallocated_Stacks : constant Boolean := False; 161 Signed_Zeros : constant Boolean := True; 162 Stack_Check_Default : constant Boolean := False; 163 Stack_Check_Probes : constant Boolean := False; 164 Stack_Check_Limits : constant Boolean := False; 165 Support_Aggregates : constant Boolean := True; 166 Support_Composite_Assign : constant Boolean := True; 167 Support_Composite_Compare : constant Boolean := True; 168 Support_Long_Shifts : constant Boolean := True; 169 Always_Compatible_Rep : constant Boolean := True; 170 Suppress_Standard_Library : constant Boolean := False; 171 Use_Ada_Main_Program_Name : constant Boolean := False; 172 Frontend_Exceptions : constant Boolean := False; 173 ZCX_By_Default : constant Boolean := True; 174 175 -- Obsolete entries, to be removed eventually (bootstrap issues) 176 177 Front_End_ZCX_Support : constant Boolean := False; 178 High_Integrity_Mode : constant Boolean := False; 179 Long_Shifts_Inlined : constant Boolean := True; 180 Functions_Return_By_DSP : constant Boolean := False; 181 Support_64_Bit_Divides : constant Boolean := True; 182 GCC_ZCX_Support : constant Boolean := True; 183 184end System; 185